Accuracy of speech transmission index predictions based on the reverberation time and signal-to-noise ratio

Laurent Galbrun, Kivanc Kitapci

    Research output: Contribution to journalArticle

    10 Citations (Scopus)
    316 Downloads (Pure)

    Abstract

    This paper examines the accuracy of the speech transmission index (STI) calculated from the reverberation time (T) and signal-to-noise ratio (LSN) of enclosed spaces. Differences between measured and predicted STIs have been analysed in two rooms (reverberant vs. absorbent), for a wide range of absorption conditions and signal-to-noise ratios (sixteen tests). The STI was measured using maximum length sequence analysis and predictions were calculated using either measured or predicted values of T and LSN, the latter assuming diffuse sound field conditions. The results obtained for all the conditions tested showed that STI predictions based on T and LSN tend to underestimate the STI, with differences between measured and predicted STIs always lower than 0.1 (on a 0.0 - 1.0 scale), and on average lower than 0.06. According to previous research, these differences are noticeable and therefore non-negligible, as 0.03 is the just noticeable difference in STI. The use of either measured or predicted values of T and LSN provided similar STI predictions (i.e. non-noticeable changes), with differences between predictions that are on average lower than 0.03 for the absorbent room, and lower than 0.01 for the reverberant room.
    Original languageEnglish
    Pages (from-to)1-14
    Number of pages14
    JournalApplied Acoustics
    Volume81
    DOIs
    Publication statusPublished - Jul 2014

    Fingerprint Dive into the research topics of 'Accuracy of speech transmission index predictions based on the reverberation time and signal-to-noise ratio'. Together they form a unique fingerprint.

    Cite this